/* OER Frontend - Main Styles
 * Professional, clean design for educational resources platform
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-secondary: #64748b;
  --color-secondary-dark: #475569;

  --color-success: #22c55e;
  --color-success-light: #dcfce7;
  --color-success-dark: #166534;

  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-warning-dark: #92400e;

  --color-danger: #ef4444;
  --color-danger-light: #fee2e2;
  --color-danger-dark: #991b1b;

  --color-background: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --container-max-width: 1200px;
  --navbar-height: 64px;
  --sidebar-width: 280px;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

main {
  padding: var(--spacing-xl) 0;
  min-height: calc(100vh - var(--navbar-height) - 100px);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.flex-1 { flex: 1; }
.flex-grow { flex-grow: 1; }

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-background);
  border-color: var(--color-border-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: white;
}

.btn-danger {
  background-color: var(--color-danger);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-dark);
}

.btn-success {
  background-color: var(--color-success);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background-color: var(--color-success-dark);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-muted);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-background);
  color: var(--color-text);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

/* Login Button - Special Style */
.btn-login {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%);
  border: none;
  border-radius: 50px;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.35), 0 2px 4px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: none;
  letter-spacing: 0.3px;
}

.btn-login:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #1e40af 100%);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45), 0 3px 6px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.btn-login:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn-login .material-icons {
  font-size: 18px;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
}

.btn-icon {
  padding: var(--spacing-sm);
  min-width: 40px;
  min-height: 40px;
}

.btn-icon.btn-sm {
  padding: var(--spacing-xs);
  min-width: 32px;
  min-height: 32px;
}

/* ============================================
   Forms
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-group .help-text {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-control:disabled {
  background-color: var(--color-background);
  cursor: not-allowed;
}

.form-control::placeholder {
  color: var(--color-text-light);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  padding-right: var(--spacing-2xl);
}

/* Checkbox and Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-check label {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  cursor: pointer;
  margin-bottom: 0;
}

/* Form Row */
.form-row {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.form-row .form-group {
  flex: 1;
  min-width: 200px;
}

/* Form Actions */
.form-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

/* ============================================
   Cards
   ============================================ */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-background);
}

/* ============================================
   Badges
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--radius);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.badge-secondary {
  background-color: var(--color-background);
  color: var(--color-text-muted);
}

.badge-success {
  background-color: var(--color-success-light);
  color: var(--color-success-dark);
}

.badge-warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning-dark);
}

.badge-danger {
  background-color: var(--color-danger-light);
  color: var(--color-danger-dark);
}

/* File type badges */
.badge-file {
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.badge-pdf { background-color: #fecaca; color: #991b1b; }
.badge-doc { background-color: #dbeafe; color: #1e40af; }
.badge-xls { background-color: #dcfce7; color: #166534; }
.badge-ppt { background-color: #fed7aa; color: #9a3412; }
.badge-img { background-color: #f3e8ff; color: #7e22ce; }
.badge-video { background-color: #cffafe; color: #0e7490; }
.badge-audio { background-color: #fef3c7; color: #92400e; }
.badge-bes { background-color: #dbeafe; color: #1e40af; font-weight: 600; }

.bes-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 4px 10px;
  background: #dbeafe;
  color: #1e40af;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
}

/* ============================================
   Tags
   ============================================ */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  background-color: #f3f4f6;
  color: #4b5563;
  border-radius: 9999px;
  border: 1px solid #e5e7eb;
  font-weight: 500;
}

.tag-removable {
  padding-right: var(--spacing-xs);
}

.tag-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-left: var(--spacing-xs);
  font-size: 10px;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
}

.tag-remove:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

/* ============================================
   Tables
   ============================================ */
.table-container {
  overflow-x: auto;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  background-color: var(--color-background);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: var(--color-background);
}

/* ============================================
   Alerts & Messages
   ============================================ */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.alert-success {
  background-color: var(--color-success-light);
  color: var(--color-success-dark);
  border: 1px solid var(--color-success);
}

.alert-warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning-dark);
  border: 1px solid var(--color-warning);
}

.alert-danger {
  background-color: var(--color-danger-light);
  color: var(--color-danger-dark);
  border: 1px solid var(--color-danger);
}

.alert-info {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

/* ============================================
   Empty States
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state h3 {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   Loading States
   ============================================ */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
}

.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

/* ============================================
   Progress Bar
   ============================================ */
.progress {
  width: 100%;
  height: 8px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition);
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  height: var(--navbar-height);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
  z-index: 100;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #1e293b;
  text-decoration: none;
  letter-spacing: -0.3px;
}

.navbar-brand .material-icons {
  font-size: 28px;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-brand:hover {
  color: #2563eb;
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.navbar-nav a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: #64748b;
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s ease;
  position: relative;
}

.navbar-nav a:hover {
  color: #1e293b;
  background-color: #f1f5f9;
}

.navbar-nav a.active {
  color: #2563eb;
  background-color: #eff6ff;
}

.navbar-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6, #2563eb);
  border-radius: 3px 3px 0 0;
}

.navbar-nav a .material-icons {
  font-size: 18px;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* User Menu */
.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-menu .btn-ghost {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: #f1f5f9;
  border-radius: 50px;
  color: #475569;
  font-weight: 500;
  font-size: 13px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.user-menu .btn-ghost:hover {
  background: #e2e8f0;
  color: #1e293b;
}

.user-menu .btn-ghost .material-icons {
  font-size: 18px;
  color: #64748b;
}

.user-menu .user-name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-menu .btn-secondary {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid #e2e8f0;
  border-radius: 50px;
  color: #64748b;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.user-menu .btn-secondary:hover {
  background: #fef2f2;
  border-color: #fecaca;
  color: #dc2626;
}

.user-menu .btn-secondary .material-icons {
  font-size: 16px;
}

/* Mobile menu toggle - hidden by default on desktop */
.navbar-mobile-toggle {
  display: none;
}

/* Mobile menu - hidden by default */
.mobile-menu {
  display: none;
}

/* Mobile menu backdrop - hidden by default */
.mobile-menu-backdrop {
  display: none;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background-color: #f1f5f9;
  border-radius: 50px;
  border: 1px solid #e2e8f0;
}

.lang-switcher button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 30px;
  padding: 0;
  font-size: 18px;
  background: none;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  opacity: 0.5;
  transition: all 0.2s ease;
  filter: grayscale(50%);
}

.lang-switcher button:hover {
  opacity: 0.85;
  filter: grayscale(0%);
}

.lang-switcher button.active {
  opacity: 1;
  background-color: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  filter: grayscale(0%);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  text-align: center;
  padding: 60px 0 48px;
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
  border-bottom: 1px solid #e2e8f0;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #1e293b;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 18px;
  color: #64748b;
  margin-bottom: 0;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* ============================================
   Breadcrumb
   ============================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-separator {
  color: var(--color-text-light);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* ============================================
   Back Link
   ============================================ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: #475569;
  text-decoration: none;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border: 1px solid #e2e8f0;
  border-radius: 50px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.back-link:hover {
  color: #1e293b;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-color: #cbd5e1;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transform: translateX(-2px);
}

.back-link:active {
  transform: translateX(0);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.back-link .material-icons {
  font-size: 18px;
  color: #64748b;
  transition: all 0.2s ease;
}

.back-link:hover .material-icons {
  color: #2563eb;
  transform: translateX(-2px);
}

/* Page Title Row with Back Link */
.page-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-title-row h1 {
  margin: 0;
}

/* School Code Subtitle */
.school-code-subtitle {
  margin: 4px 0 0 44px;
  font-size: 14px;
  color: #64748b;
  font-weight: 400;
}

.school-code-subtitle:empty {
  display: none;
}

/* Minimal Back Link (chevron only) */
.back-link-minimal {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: #94a3b8;
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s ease;
}

.back-link-minimal:hover {
  color: #3b82f6;
  background-color: #eff6ff;
}

.back-link-minimal:active {
  transform: scale(0.95);
}

.back-link-minimal .material-icons {
  font-size: 28px;
}

/* ============================================
   Footer
   ============================================ */
footer {
  padding: 40px 0 32px;
  text-align: center;
  color: #64748b;
  font-size: 14px;
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  border-top: 1px solid #e2e8f0;
  margin-top: auto;
}

footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

footer p {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: #475569;
}

footer p::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  border-radius: 6px;
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 3L1 9l4 2.18v6L12 21l7-3.82v-6l2-1.09V17h2V9L12 3zm6.82 6L12 12.72 5.18 9 12 5.28 18.82 9zM17 15.99l-5 2.73-5-2.73v-3.72L12 15l5-2.73v3.72z'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 3L1 9l4 2.18v6L12 21l7-3.82v-6l2-1.09V17h2V9L12 3zm6.82 6L12 12.72 5.18 9 12 5.28 18.82 9zM17 15.99l-5 2.73-5-2.73v-3.72L12 15l5-2.73v3.72z'/%3E%3C/svg%3E");
  mask-size: contain;
  -webkit-mask-size: contain;
}

footer .footer-tagline {
  font-size: 13px;
  color: #94a3b8;
  font-weight: 400;
  max-width: 400px;
  line-height: 1.5;
}

footer .footer-links {
  display: flex;
  gap: 24px;
  margin-top: 8px;
}

footer .footer-links a {
  color: #64748b;
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s ease;
}

footer .footer-links a:hover {
  color: #2563eb;
}

/* ============================================
   Material Icons
   ============================================ */
.material-icons {
  font-size: 20px;
  vertical-align: middle;
}

.material-icons.sm { font-size: 16px; }
.material-icons.lg { font-size: 24px; }
.material-icons.xl { font-size: 32px; }

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

.font-bold { font-weight: 600; }
.font-normal { font-weight: 400; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}